KR102610108B1 - Physical properties based classification method of bamboo materials for mass processing - Google Patents

Abstract

A method for clustering bamboo materials according to physical properties for mass processing performed by a computing device includes obtaining a cross-sectional image of each of the bamboo materials, distinguishing a vascular region from the remaining region in the cross-sectional image, It may include obtaining a first ratio occupied by the vascular area in a cross-sectional image, and clustering the bamboo materials based on the first ratio of each of the bamboo materials.

Description

Physical property-based classification method of bamboo materials for mass processing {PHYSICAL PROPERTIES BASED CLASSIFICATION METHOD OF BAMBOO MATERIALS FOR MASS PROCESSING}

The present invention relates to a method for classifying bamboo materials into a plurality of groups based on physical properties in order to process bamboo materials in large quantities and manufacture bamboo products.

Government regulations on the use of plastic products are increasing worldwide, and the development of eco-friendly materials that can replace plastic has become a need of the hour. Bamboo grows well without chemical fertilizers or pesticides, has a fast growth rate, and is attracting attention as a material to replace plastic because it rots more easily than plastic, which does not decompose for hundreds of years when disposed of, and emits less greenhouse gases when incinerated.

A representative example of a bamboo product that replaced plastic is a bamboo toothbrush. The bamboo toothbrush market, which seeks to replace plastic toothbrushes, is growing rapidly. Market Watch predicted that bamboo toothbrushes will dominate the global toothbrush market as various plastic product regulations and support measures for eco-friendly products replacing plastic expand around the world.

In order to manufacture industrial products such as toothbrushes by processing bamboo materials, a mass production process must be performed. Bamboo is a natural material obtained from living plants, and these natural materials have moisture content, position within the bamboo (length direction, thickness direction), and strength. Differences in physical properties occur depending on the direction of application (inside, outside). If the same processing process is performed on bamboo materials with different physical properties, problems such as defective products occur. Since mass processing systems for manufacturing industrial products are generally applied to materials with the same physical properties as plastic, mass production systems using bamboo materials cause problems such as increased defect rates.

The present invention relates to a method for classifying bamboo materials into a plurality of groups based on physical properties in order to process bamboo materials in large quantities and manufacture bamboo products. Each classified group is made up of bamboo materials with similar physical properties, and each group is processed under certain conditions, so the defect rate can be reduced even if a mass processing system is applied to bamboo materials.

The technical challenge that this embodiment aims to achieve is not limited to the technical challenges described above, and other technical challenges can be inferred from the following embodiments.

A method for clustering bamboo materials according to physical properties for mass processing performed by a computing device includes obtaining a cross-sectional image of each of the bamboo materials, obtaining a first ratio occupied by the vascular bundle area in the cross-sectional image. and clustering the bamboo materials based on the first ratio of each of the bamboo materials.

The vascular bundle includes a metaplastic xylem, and the method further comprises dividing the vascular region into a metaplastic xylem region and a remaining region, and obtaining a second ratio occupied by the metaplastic xylem region in the vascular region, The clustering step may include clustering the bamboo materials based on the first ratio and the second ratio.

The method further includes obtaining a weight and a thickness of each of the bamboo materials, and the clustering step includes clustering the bamboo materials based on at least one of the weight and the thickness and the first ratio. May include steps.

A method for clustering bamboo materials according to physical properties for mass processing performed by a computing device, comprising: acquiring a cross-sectional image of each of the bamboo materials; acquiring at least one of the color and shape of the vascular region; and clustering the bamboo materials based on at least one of the color and shape.

The method further includes obtaining a weight and a thickness of each of the bamboo materials, wherein the clustering step includes, based on at least one of the weight and the thickness and at least one of the color and the shape, the bamboo materials. It may include clustering the materials.

The bamboo toothbrush manufacturing method includes preparing materials that are stick-shaped bamboo, selecting some of the materials as materials suitable for manufacturing a bamboo toothbrush, and clustering the materials based on at least one of weight, thickness, and vascular characteristics. , and manufacturing a bamboo toothbrush by varying processing conditions for each cluster generated by the clustering, wherein the selecting step includes obtaining a cross-sectional image of the material and dividing the cross-sectional image from a binary image obtained by binarizing the cross-sectional image. Calculate the vascular bundle ratio, and if the vascular bundle ratio is greater than the reference value, the material is classified as unsuitable for manufacturing the bamboo toothbrush. If the weight or thickness of the material is outside the standard range, the material is classified as unsuitable for manufacturing the bamboo toothbrush. classification, and the vascular bundle characteristics may include at least one of vascular bundle ratio, vascular bundle color, and vascular bundle shape obtained from the cross-sectional image.

For materials belonging to different clusters, the hot pressing process is performed under different conditions, and the higher the vascular ratio, the greater the weight, the thicker the thickness, or the darker the color, the hotter it is under higher pressure conditions or for a longer time. A pressing process can be performed.

The step of manufacturing the bamboo toothbrush includes a milling process step of processing the current material into the shape of a toothbrush stick, inserting the pre-treated material into a press mold and subjecting the bamboo toothbrush to a temperature condition of 160°C to 210°C and a pressure of 0.2 MPa to 4 MPa. A hot pressing process step of heating and pressing for a time of 2 minutes or more and 6 minutes or less under conditions, sanding and coating the material on which the hot pressing process is completed, a drilling step of forming a plurality of holes in the head portion of the material, And it may include planting toothbrush bristles into the plurality of holes.

The press mold includes a lower mold and an upper mold, and the hot pressing process step may be characterized in that the material for which the milling process has been completed is placed in the lower mold and pressed in one direction in the upper mold only once. .

A bamboo toothbrush manufactured by the bamboo toothbrush manufacturing method may be provided.

The present invention relates to a method for classifying bamboo materials into a plurality of groups based on physical properties in order to process bamboo materials in large quantities and manufacture bamboo products. Each classified group is made up of bamboo materials with similar physical properties, and each group is processed under certain conditions, so the defect rate can be reduced even if a mass processing system is applied to bamboo materials.

Figure 1 shows a cross section of bamboo material, according to one embodiment.
Figure 2 shows a stress-strain graph of bamboo materials, according to one embodiment.
Figure 3 shows a method of manufacturing a bamboo product, according to one embodiment.
Figure 4 shows a method of manufacturing a bamboo toothbrush, according to one embodiment.
Figure 5 shows a material that is bamboo sticks, according to one embodiment.
Figure 6 shows a cross-section of a material, according to one embodiment.
7 shows a binary image of a cross-section of a material, according to one embodiment.
Figure 8 shows material after a milling process has been completed, according to one embodiment.
Figure 9 shows a press form used for a hot pressing process, according to one embodiment.
Figure 10 shows pressing a material on which a milling process has been completed, according to one embodiment.
Figure 11 shows material after a hot pressing process has been completed, according to one embodiment.
Figure 12 shows material after sanding and coating, according to one embodiment.
Figure 13 shows a bamboo toothbrush with drilling and hair transplantation completed, according to one embodiment.
Figure 14 illustrates a method for clustering bamboo material, according to one embodiment.
Figure 15 shows a cross-section for obtaining the vascular ratio of bamboo material, according to one embodiment.
Figure 16 shows a binary image of a cross-sectional image with different shapes of vascular bundles, according to one embodiment.
Figure 17 shows metaxylem vessels in a vascular bundle, according to one embodiment.
FIG. 18 shows a binary image displaying separate parts of the posterior xylem within the vascular bundle, according to an embodiment.

Below, several embodiments will be described clearly and in detail with reference to the accompanying drawings so that those skilled in the art (hereinafter referred to as skilled in the art) can easily practice the present invention. will be.

Bamboo is in the spotlight as a material that can replace plastic, but since it is a natural material obtained from nature, there are differences in physical properties between materials. Physical properties may include stress, strain, strength, density, etc. Differences in physical properties not only occur depending on the variety of bamboo, collection time, growth environment, etc., but can also occur depending on the location within the bamboo even if the materials are obtained from the same bamboo. Alternatively, differences in physical properties may occur as bamboo materials are exposed to various environments after being separated from bamboo.

Figure 1 shows cross-sections of bamboo materials belonging to different genera, according to one embodiment. The first bamboo material (L) may be Moso bamboo (Phyllostachys) and the second bamboo material (R) may be Luong bamboo (Dendrocalamus). Figure 1 shows a cross section of a first bamboo material (L) and a cross section of a second bamboo material (R). Referring to Figure 1, the first bamboo material (L) and the second bamboo material (R) show different vascular bundle shapes, colors, and distributions. The vascular bundle of the first bamboo material (L) is peanut-shaped and dark brown to black in color, and the vascular bundle of the second bamboo material (R) is clova-shaped and beige to light brown in color. The vascular distribution of the first bamboo material (L) and the second bamboo material (R) is also different. In the case of the first bamboo material (L), the size of the vascular bundle becomes smaller and denser as it goes outward, but the second bamboo material (R) shows relatively less of the above characteristics.

Figure 2 shows a stress-strain graph of bamboo materials, according to one embodiment. Referring to Figure 2, it can be seen that bamboo materials exhibit different physical properties if they have different vascular characteristics.

Combining Figures 1 and 2, it can be seen that vascular features cause major differences in the physical properties of bamboo materials. The computer device may obtain vascular features based on at least one cross section of the bamboo material and perform clustering to classify the bamboo materials into a plurality of groups based on the vascular features. Bamboo materials belonging to the same cluster have similar physical properties, making them suitable for mass production and reducing defect rates.

Figure 3 shows a method of manufacturing a bamboo product, according to one embodiment. Since the bamboo toothbrush below is a representative example of a product manufactured from bamboo materials, it should be understood that the manufacturing method below is not limited to the manufacturing method of the bamboo toothbrush and the bamboo toothbrush can be replaced with a bamboo product.

Referring to Figure 3, the method of manufacturing a bamboo product may include a material selection step (S11), a clustering step (S12), and a step of manufacturing a bamboo product by processing each cluster (S13). The method of Figure 3 may be performed by at least one machine or computing device.

The material selection step (S11) is a step of excluding materials unsuitable for processing into bamboo products. For example, in the material selection step (S10), rectangular bamboo materials having a predetermined size may be prepared, and some of the prepared materials may be selected as materials suitable for manufacturing a bamboo toothbrush. The material selection step (S11) may include classifying bamboo materials as unsuitable for manufacturing a bamboo toothbrush.

Bamboo materials are obtained from bamboo and cut into predetermined sizes at the request of the manufacturer, but in reality, the size or weight of each bamboo material may not be constant. In the case of the wood processing process, it is difficult to do precisely, and even if obtained in almost the same size, changes may occur due to the influence of humidity during transportation. Figure 5 shows a rectangular bamboo material of a predetermined size according to an embodiment. According to one embodiment, the material is cut to 188mm (width), 15mm (length), and 5.65mm (height), but each of the bamboo materials actually prepared for mass processing may be different from the predetermined size.

Bamboo has different growth conditions depending on the harvesting time and the density of its structure is different, so its moisture content is different and different carbonization conditions are required. Since the thickness changes depending on the period from collection to preparation for the manufacture of bamboo toothbrushes and the humidity of the environment exposed during this period, it is necessary to determine once again according to predetermined standards whether the material is suitable for manufacturing bamboo toothbrushes.

Among the materials prepared in the material selection step (S11), if the weight or thickness is outside the standard range, it may be judged as unsuitable for manufacturing a bamboo toothbrush. In terms of thickness, materials that cannot achieve the minimum compressibility (less than 1%) or exceed the maximum compressibility (more than 20%) are judged to be unsuitable for manufacturing bamboo toothbrushes and can be excluded as materials for manufacturing bamboo toothbrushes. Among the prepared materials, materials whose weight is more than the standard value are judged to be unsuitable for manufacturing bamboo toothbrushes and may be excluded as materials for manufacturing bamboo toothbrushes. The reference value may be 14g, but is not limited thereto.

In order to determine materials suitable for processing in the material selection step (S11), the vascular bundle ratio of each of the prepared materials may be additionally considered. The vascular bundle is a passage for the movement of water and nutrients necessary for the plant, and the vascular bundle ratio may refer to the ratio of the area corresponding to the vascular bundle to the area of the cross section of the material (for example, 21 and 23 in Figure 6). If the vascular bundles are dense, drilling is difficult and the processability is poor, such as anchors not being easily inserted during the planting process. Therefore, if the vascular bundle ratio is more than the standard value, it is judged to be unsuitable for manufacturing bamboo toothbrushes and can be excluded.

The material selection step (S11) may include classifying the material as unsuitable for manufacturing a bamboo toothbrush if the vascular bundle ratio of the cross section of the material is greater than or equal to a reference value. Referring to Figure 6, it may be determined whether at least one of the vascular bundle ratios of the material cross-sections 21 and 23 in the Z-axis direction is greater than or equal to the reference value. According to one embodiment, the vascular bundle ratio for a portion of the cross section, rather than the vascular bundle ratio for the entire cross section of the material, may be considered. As an example, the vascular bundle ratio of a part of the cross section corresponding to a predetermined length on the side with the smaller vascular bundle ratio among the cross sections of the material may be considered. The drilling process (S16) and the planting process (S17) can be performed on a surface with a low vascular bundle ratio (e.g., the side with a smaller vascular bundle ratio between the upper surface (plane) and the lower surface (floor or bottom) of Figure 6). Because.

According to one embodiment, the computing device may capture a cross-sectional image of the bamboo material 20 of FIG. 6 and divide the captured cross-sectional image into a vascular region and a remaining region. As an example, the computing device may obtain a binary image in which the vascular region and the remaining region are separated from the cross-sectional image. The computing device may normalize the cross-sectional image to size N, where N is the number of pixels. A computing device may generate a binary image by binarizing a normalized cross-sectional image. In this embodiment, the vascular region may be displayed as 1 (Black) and other regions may be displayed as 0 (White), or the vascular region may be displayed as 0 (Black) and the other regions may be displayed as 1 (White). In this specification, various widely known image processing techniques such as morphological operations, histogram analysis, edge extraction, CNN (Convolutional Neural Network), and threshold extraction may be used as the binarization method. 7 shows a binary image of a cross-section of a material, according to one embodiment. The vascular ratio of the entire binary image (BI) can be compared to a reference value, or the vascular ratio of a portion of the binary image (BI) with a small vascular ratio (PR, indicated by a dotted line) can be compared to a reference value. According to one embodiment, the computing device may classify the current material as unsuitable for manufacturing a toothbrush if the vascular ratio is 40% or more, but the reference value for the vascular ratio is not limited thereto.

The material clustering step (S12) is a step in which bamboo materials selected as suitable for manufacturing are classified into a plurality of clusters according to physical properties. In the material clustering step (S12), bamboo materials can be classified into a plurality of clusters according to weight, thickness, vascular characteristics, etc., and bamboo materials included in the same cluster have similar physical properties. For example, bamboo materials may be classified into N clusters (N is a positive integer) based on at least one of the thickness, weight, and vascular characteristics of the bamboo material. The material clustering step will be described in detail later with reference to FIG. 14.

In the bamboo product manufacturing step (S13), bamboo products can be manufactured through a separate processing process for each cluster. Separate processing processes can be defined according to the physical properties of the bamboo materials belonging to the cluster. A bamboo toothbrush may be manufactured by varying processing conditions (eg, at least one of pressure, temperature, time, and speed) for each cluster generated by clustering. For example, the higher the vascular ratio, the higher the proportion of epiphytic xylem within the vascular bundle, and the darker the brightness of the vascular bundle, the hot pressing process can be performed using higher pressure or for a longer time. For example, drilling, planting, and coating processes may be performed by applying different speeds or times for each cluster.

Figure 4 shows a method of manufacturing a bamboo toothbrush, according to one embodiment.

The bamboo toothbrush manufacturing method of FIG. 4 may be a detailed step of the step (S13) of manufacturing a bamboo product by processing each cluster described with reference to FIG. 3. According to one embodiment, at least one of the milling (S21), pretreatment (S22), hot pressing (S23), sanding and coating (S24), drilling (S25), and hair transplantation (S26) of Figure 4 is performed under different conditions for each cluster. It can be performed under (manufacturing temperature, time, pressure, etc.).

Referring to Figure 4, the method of manufacturing a bamboo toothbrush includes the steps of performing a milling process (S21), performing a hot pressing process (S23), performing a sanding and coating process (S24), and performing a drilling process. (S25), and a hair transplant process performing step (S26). The method of manufacturing a bamboo toothbrush may be performed by at least one machine or computing device, and when the current process is completed, the processes may be performed sequentially by transferring the completed material to the device or computing device where the next process is performed.

The milling process performance step (S21) is a step of cutting the selected bamboo material (hereinafter referred to as material) into the shape of a toothbrush stick. The milling process may include CNC machining. CNC machining means setting up the processing material on a table and processing it to obtain the shape with the precision designed by the user. CNC stands for Computer Numerical Control and refers to an NC (numerical control device) with a built-in computer. In other words, it is a control method that creates a command tape (NC program) that punches information on the shape of the workpiece or processing conditions, and the information processing circuit reads this to generate command pulses and automatically executes processing as instructed. Therefore, compared to the conventional manual process, the quality of the processed product is stable and the process time can be significantly shortened, which has the advantage of reducing manufacturing costs.

In the milling process, the material, which is bamboo sticks, can be processed into the shape of a toothbrush stick. The material can form the shape of the toothbrush base in the X and Y axes and the height of the toothbrush base in the Z axis direction. The height of the toothbrush stand may refer to the height before compression without going through the hot pressing process (S23).

Poisson's ratio refers to the ratio of transverse strain and longitudinal strain when vertical stress is applied to a material. Poisson's ratio is an index of the strength of a material that is important to consider when determining deformation in the elastic deformation region. When a vertical stress is applied to most materials, the material is deformed to be compressed in the vertical direction where the vertical stress acts, and to expand in the horizontal direction perpendicular to the vertical stress. Therefore, in the milling process, the rod-shaped bamboo material can be processed considering that it expands in the X and Y axes by the pressure applied in the Z axis direction in the hot pressing process (S23). Figure 8 shows a milling process according to one embodiment.

In the hot pressing process step (S23), heat and pressure are applied to the material to remove most of the moisture and pores contained in the bamboo, and the sugar contained in the bamboo can be discharged to increase the density of the bamboo. Therefore, the rigidity of bamboo is improved, which not only extends the lifespan of the product, but also increases the freedom of design and processing in the future. In addition, as the uneven surface of bamboo is compressed, surface roughness is improved, improving the feeling of use and reducing the mold occurrence rate. In the hot pressing step (S23), bamboo toothbrushes (FIG. 11) having the same shape can be manufactured in large quantities by inserting the bamboo material into the press mold (40 in FIG. 9) and processing it to have the same shape by heating and pressing.

Referring to Figure 9, the press form 40 may include an upper mold 41 and a lower mold 42. The lower mold 42 has a plate shape and may have a cavity 43 through which materials can be placed inside. At this time, at least one cavity 43 may be formed as a space where the toothbrush stand is formed. As the number of cavities 43 increases, the number of toothbrush stands that can be produced through a single process will increase. The size and shape of the cavity 43 are not specifically limited and can be changed to suit the shape of the toothbrush stand. The upper mold 41 may be in close contact with the upper surface of the lower mold 42 by pressing the material into a plate shape. Accordingly, the processed material located in the cavity 43 can be compressed in the Z-axis direction and simultaneously expanded in the X and Y-axis directions.

According to one embodiment, the hot pressing process may include placing a material in the lower mold 42 and compressing the material to a desired height by pressing it into the upper mold 41 while applying heat to the material. . Accordingly, bamboo can be compressed in the Z-axis direction to have a certain height, and can be expanded to a certain length in the X and Y-axis directions by pressure applied in the Z-axis direction. At this time, the length expanded in the X and Y axes may vary depending on the pressure applied in the Z axis direction. According to one embodiment, in the hot pressing process, pressing is performed only once in one direction. For example, the hot pressing process may be characterized by placing the material in the lower mold and pressing it into the upper mold only once in one direction (e.g., the Z-axis direction in FIGS. 6 and 10).

Referring to Figure 10, the hot pressing process can be performed by pressing the material that has undergone the milling process in the Z-axis direction only once. In these embodiments, the top and bottom surfaces of the material may have a smooth surface due to the hot pressing process, but the sides (dark dotted areas) may not. However, the present invention is not limited to this, and the hot pressing process involves changing the material in a different direction according to the shape of the toothbrush base, placing it in a mold (lower mold) that matches the shape, and pressing twice or more in each direction. It may also include steps.

In one embodiment, the hot pressing process may be performed by heating at a temperature of 160°C or more and 210°C or less for 2 minutes or more and 6 minutes or less and pressing at a pressure of 0.2 MPa or more and 4 MPa or less. The above conditions are one example, and the conditions under which the hot pressing process is performed may vary depending on the initial thickness (compression rate) and carbonization state.

If the heating temperature is less than 160°C, the sugar released from the bamboo is not sufficiently caramelized and the coating layer is not formed evenly. If the heating temperature exceeds 210°C, the bamboo is excessively carbonized, making it impossible to achieve a beautiful surface color, and the hair transplant process to be described later. In step S26, the toothbrush stand may break during hair transplantation.

In addition, if the pressure is less than 0.2 MPa, the moisture contained in the bamboo cannot be sufficiently removed, and considering the physical properties of the bamboo itself, it is better to pressurize at a pressure higher than 0.2 MPa. To protect the upper mold 41 and lower mold 42, it is recommended not to exceed 4 MPa.

In addition, if the hot pressing process time is less than 2 minutes, the moisture contained in the bamboo is not sufficiently removed and the coating layer is formed, and compression is not performed well. Additionally, due to the spring back phenomenon, a phenomenon may occur where part of the material is restored even if it is compressed. If the hot pressing process time exceeds 6 minutes, it may be excessively compressed and become thinner than desired, and carbonization may progress excessively, making the material more brittle and brittle.

Referring again to FIG. 4, in the sanding and coating process performing step (S24), the material that has undergone the hot pressing process can be sanded and coated to smooth the surface and improve surface roughness. According to one embodiment, if hot pressing is performed only once in the direction of pressing the upper and lower surfaces of the toothbrush base, sanding may be performed only on the side of the toothbrush base. In other words, since the upper and lower surfaces can have smooth surfaces due to hot pressing, sanding is not necessary, so sanding of the upper and lower surfaces is omitted to shorten the unnecessary sanding process. According to one embodiment, the coating process may be performed using a spray on a material that has undergone a sanding process.

In the drilling process performance step (S25), a plurality of holes for hair transplantation may be formed in the head portion of the material that has undergone the sanding and coating process using a drill bit. A process (S26) of planting toothbrush bristles into the plurality of holes formed through the drilling process (S25) may be performed.

Figure 14 shows a method for clustering bamboo materials based on physical properties for mass processing or mass production, according to one embodiment.

Figure 14 may show a detailed flow chart of the material clustering step (S12) of Figure 3, but is not limited thereto. Figures 14 to 18 are diagrams to explain a method for classifying bamboo materials with similar physical properties into one cluster in order to mass-process bamboo materials to manufacture arbitrary products. Any product may include, but is not limited to, a bamboo toothbrush. 14 may be performed by at least one machine or computing device.

In step S31, the computing device may acquire a cross-sectional image of each bamboo material. L and R in Figure 1 represent cross-sectional images obtained according to one embodiment. The cross-sectional image may be a color image or a gray-scale image.

In step S32, the computing device may analyze the cross-sectional image to obtain vascular features. Vascular characteristics may include vascular bundle ratio, vascular bundle shape, vascular bundle color, etc.

The vascular ratio refers to the ratio of the vascular bundle area to the cross-sectional area and is explained with reference to Figures 3 and 7, so detailed description will be omitted. The higher the vascular ratio, the higher the density and yield strength of the bamboo material. Referring to Figure 15, according to one embodiment, the vascular bundle ratio may mean the ratio that the vascular bundle area occupies in the total area of the cross section (for example, A in Figure 15). According to another embodiment, the vascular bundle ratio may mean the ratio that the vascular bundle area occupies in some area of the cross section (for example, A1 or A2 in Figure 15).

According to another embodiment, the vascular bundle ratio is a number defined based on the vascular ratio in the first portion of the cross section (e.g., A1 in Figure 15) and the vascular bundle ratio in the second portion (e.g., A2 in Figure 15). It can be. The second part (A2) is a partial area corresponding to the reference length (d1) from the top (the part where planting is performed) when the bamboo material is placed on the floor, and the first part (A1) is the second part in the whole (A). It may mean the area of the remaining parts excluding part (A2). The computing device may obtain vascular bundle distribution information based on the vascular bundle ratio of the first part (A1) and the second part (A2). For example, if the vascular bundle ratio of the first part (A1) is 40% and the vascular bundle ratio of the second part (A2) is 60%, the current bamboo material can be interpreted as having a distribution in which the vascular bundles become denser as they go outward or upward. there is. The vascular ratio may include vascular distribution information based on the vascular ratio of the first part (A1) and the second part (A2). As an example, the vascular distribution index representing the vascular distribution can be calculated by dividing the vascular ratio of the second part (A2) by the vascular ratio of the first part (A1).

The vascular bundle shape is an element related to the bamboo variety, and if the vascular bundle shape is the same or similar, the material can be judged to have been obtained from the same variety of bamboo. 16L and 16R in Figure 16 represent binary images of cross-sectional images with different shapes of vascular bundles.

Vascular color is related to the hardness of the bamboo material. The brighter the vascular bundle color, the softer the bamboo material, and the darker the vascular bundle color, the harder the bamboo material. Vascular brightness can be defined as the average of the brightness of the vascular region. Vascular brightness can be defined as the average of pixel values of the portion corresponding to the vascular region. For example, it may be defined as the average of pixel values (eg, 0 to 255) in a gray scale image for the portion corresponding to the vascular region. In the present specification, vascular bundle brightness is a representative example representing the characteristics of vascular bundle color, but is not limited thereto. Vascular color may refer to a specific value or a multidimensional vector expressed by a known color system such as RGB space, HSV space, or CMYK space for the portion corresponding to the vascular region. “Part corresponding to the vascular area” for determining color refers to the color of a specific pixel among the part corresponding to the vascular area, or the representative color of the part corresponding to the vascular area (e.g., the average color of R, G, and B respectively) ) may mean.

Vascular characteristics may further include the proportion of metaxylem vessels within the vascular bundle. Figure 17 shows metaxylem vessels (dotted circles) in a vascular bundle, according to one embodiment. The smaller the proportion of epiphytic xylem in the vascular bundle, the higher the bending strength, and the higher the proportion of epiphyte xylem in the vascular bundle, the lower the bending strength.

The proportion occupied by the metaplastic xylem in the vascular bundle is determined by distinguishing the metaplastic xylem portion from the non-metagenetic xylem portion within the vascular region of the cross-sectional image (or obtaining a separated image), and determining the proportion of the metaplastic xylem region in the area of the vascular region. It can be determined as a ratio. FIG. 18 shows a binary image in which the later xylem portion within the vascular bundle (black portion) is displayed in white at each of 16L and 16R of FIG. 16, according to an embodiment. Binarization methods can use various widely known image processing techniques such as morphological operations, histogram analysis, edge extraction, CNN (Convolutional Neural Network), and threshold extraction.

Referring again to Figure 14, at step S33, the computing device may cluster the bamboo materials into a plurality of clusters based on at least one of the vascular characteristics described above. Clustering is classifying bamboo materials into a plurality of clusters according to at least one criterion and may be performed based on at least one of the vascular characteristics. There may be only one vascular feature that serves as a standard for clustering, but there may be two or more. Clustering techniques may include K-means clustering, DB-SCAN, SVM (Support Vector Machine), KNN (K Nearest Neighbors), etc. The number of clusters generated may vary depending on the number or physical properties of bamboo materials currently prepared for processing. As an example, if 100 bamboo materials obtained from different species of bamboo are clustered based on vascular characteristics, the bamboo materials can be classified into 5 clusters. When 100 bamboo materials obtained from the same variety of bamboo are clustered based on the vascular ratio, the bamboo materials can be classified into three clusters. When 100 bamboo materials obtained from the same variety of bamboo are clustered based on vascular ratio, color, and shape, the bamboo materials can be classified into 6 clusters. In other words, bamboo materials can be classified into the optimal number through clustering techniques.

Clustering can also be performed by defining an absolute standard for vascular characteristics, matching the absolute standard with each of the clusters in advance, and then comparing the vascular characteristics of the current bamboo material with the predetermined absolute standard to classify the current bamboo material into a specific cluster. In this embodiment, the number of clusters is predetermined before clustering is performed. Even if clustering is completed, it is possible that there is no bamboo material classified into a specific cluster, or it is possible that all bamboo materials are classified into one cluster. For example, clusters A, B, and C each have different predetermined vascular characteristics and are predetermined before clustering is performed. Currently, the vascular characteristics of bamboo materials can be analyzed and classified into a matching cluster (one of A, B, and C) by comparing them with the predetermined vascular characteristics.

In the method of FIG. 14 (step S33), the computing device can perform clustering by further considering the weight and thickness of the bamboo material. That is, the computing device may further include weight and/or thickness as criteria for clustering, as well as vascular characteristics of the bamboo material.

Bamboo materials classified into one cluster created by clustering have similar physical properties to each other, so even if hot pressing, drilling, or coating is performed under the same conditions, products of consistent quality can be manufactured and the defect rate is significantly reduced. For example, the higher the vascular ratio, the higher the proportion of epiphytic xylem within the vascular bundle, and the darker the brightness of the vascular bundle, the higher the pressure can be used to perform the hot pressing process.

Bamboo products may be manufactured by varying processing conditions (eg, at least one of pressure, temperature, time, and speed) for each cluster created by clustering. For example, the higher the vascular ratio, the higher the proportion of epiphytic xylem within the vascular bundle, and the darker the brightness of the vascular bundle, the hot pressing process can be performed using higher pressure or for a longer time. For example, drilling, planting, and coating processes may be performed by applying different speeds or times for each cluster. The clustering method may be a preparation or pre-processing process performed before mass processing is applied to bamboo materials.

The descriptions are intended to provide example configurations and operations for implementing the invention. The technical idea of the present invention will include not only the embodiments described above, but also implementations that can be obtained by simply changing or modifying the above embodiments. In addition, the technical idea of the present invention will also include implementations that can be easily achieved by changing or modifying the embodiments described above.

Claims (10)

In a method for clustering bamboo materials according to physical properties for mass processing performed by a computing device,
Obtaining cross-sectional images of each of the bamboo materials;
Obtaining a first ratio occupied by the vascular region in the cross-sectional image;
distinguishing the vascular region from the postnatal xylem region and the remaining region;
Obtaining a second ratio occupied by the epivascular area in the vascular area; and
A method for clustering bamboo materials according to physical properties for mass processing, comprising clustering the bamboo materials based on the first ratio and the second ratio of each of the bamboo materials. delete According to paragraph 1,
Further comprising obtaining the weight and thickness of each of the bamboo materials,
The clustering step is,
A method for clustering bamboo materials according to physical properties for mass processing, comprising clustering the bamboo materials based on at least one of the weight and the thickness and the first ratio and the second ratio. delete delete In the bamboo toothbrush manufacturing method,
Preparing materials that are stick-shaped bamboo and selecting some of the materials as suitable materials for manufacturing a bamboo toothbrush;
clustering the materials based on vascular characteristics; and
A step of manufacturing a bamboo toothbrush by varying processing conditions for each cluster generated by the clustering,
The selecting step includes acquiring a cross-sectional image of the material, calculating the vascular bundle ratio from a binary image obtained by binarizing the cross-sectional image, and classifying the material as unsuitable for manufacturing the bamboo toothbrush if the vascular bundle ratio is greater than a reference value. , If the weight or thickness of the material is outside the standard range, the material is classified as unsuitable for manufacturing the bamboo toothbrush,
The vascular bundle characteristic includes at least one of vascular bundle ratio, vascular bundle color, and vascular shape obtained from the cross-sectional image. According to clause 6,
Bamboo toothbrush manufacturing method where the hot pressing process is performed under different conditions for materials belonging to different clusters, and the higher the vascular bundle ratio or the darker the vascular bundle color, the hot pressing process is performed under higher pressure conditions or for a longer time. According to clause 6,
The step of manufacturing the bamboo toothbrush is,
A milling process step of processing the current material into the shape of a toothbrush stick;
A hot pressing process step of inserting the material into a press mold and heating and pressing it for 2 minutes or more and 6 minutes or less under temperature conditions of 160°C or more and 210°C or less and pressure conditions of 0.2 MPa or more and 4 MPa or less;
Sanding and coating the material on which the hot pressing process has been completed;
A drilling step of forming a plurality of holes in the head portion of the material; and
A bamboo toothbrush manufacturing method comprising the step of planting toothbrush bristles in the plurality of holes. According to clause 8,
The press form includes a lower mold and an upper mold,
The hot pressing process step is a method of manufacturing a bamboo toothbrush, characterized in that the material on which the milling process has been completed is placed in the lower mold and pressed only once in one direction in the upper mold. A bamboo toothbrush manufactured by the bamboo toothbrush manufacturing method of any one of claims 6 to 9.

Images